To input a stress-strain curve in ANSYS Workbench, you need to follow a few specific steps. First, it’s important to note that ANSYS Workbench requires plastic strain data instead of total strain data.
The figures below shows the relationship between total, plastic and elastic strain.
The total strain in stress-strain curves consists of both plastic and elastic strain, as shown in the figures below. You can calculate the strain components using the formulas: elastic strain (ϵel) = stress (σ) / modulus of elasticity (E) and total strain (ϵtotal) = plastic strain (ϵp) + elastic strain (ϵel).
Once you have the stress-strain data and have converted it to plastic strain, you can input it into ANSYS Workbench using the following steps:
Step 1: Go to Engineering Data In your ANSYS project, click on Engineering Data.
Step 2: Select the material for which you want to input the stress-strain curve Under the “outline of Schematic” section, select the material you are working with. For example, if you are working with Alloy 625, select that material.
Step 3: Add the plasticity model of choice Choose an appropriate plasticity model (see ANSYS Plasticity Models Explained for more information on this article). Double-click on the chosen model, and it will appear as an option under the properties of the material.
Step 4: Select the plasticity model from material properties Under the material properties, select the plasticity model you added in the previous step. For example, in the image below, “Multilinear Kinematic Hardening” is selected.
Step 5: Input the stress-strain data The final step is to input the stress-strain data. Make sure to specify the temperature under Column A, as the stress curve is only valid at a certain temperature. You can define multiple curves for different temperatures if necessary.
With these steps, you can successfully input a stress-strain curve into ANSYS Workbench.